In the article, the authors present a method for determining the resistance and reactance of the high-current path based on measurements taken with a power quality analyzer. The method was verified on actual installations powering arc devices, and the obtained results were compared with the values of high-current path parameters determined by other methods.The high-current path is a set of series-connected elements of the arc furnace circuit, including electrodes, the secondary side busbar system (electrode holders, busbars or electrode arm pipes, flexible cables, and busbar connections to the transformer), designed to deliver electrical power from the transformer to the charge [4].
Knowledge of the high-current path parameters allows for the determination of the operating characteristics of the arc device, which represent the relationships between the basic electrical and thermal quantities defining the furnace’s operating state as a function of the arc current [2].
Operating characteristics are determined for individual furnace transformer taps and can be calculated using computational methods or, for operating equipment, using measurement methods. One such method, presented in this paper, is based on a short-circuit test of the electrodes with the charge. (…)
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Source: Logistyka Magazine